Using Advanced Bitmap Color Manipulation - Page 8

Note that you can also use negative values on the channels. For example:

Channel

% Value

Additional Value

Red

-100%

256

Green

-100%

256

Blue

-100%

256

Alpha

100%

0

This will invert all the channels - transforming its "brightness values" into, in fact, "darkness values" - and then pumping its values (that are now negative) up again by adding a 256
value to them (the maximum value a color channel can have). The result is an "inverse" image:

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